Differences in Esterase Distribution Detected by Electrophoresis as Evidence of Continuing Interspecific Hybridization in the Genus Senecio

The distribution of esterases of different mobility, located by acrylamide gel electrophoresis, was compared for different populations of plants of the genus Senecio in Central Scotland. Evidence was obtained of continued interspecific hybridization, with gene flow from Senecio squalidus L. to Senecio vulgaris L.